just finished my b18b1 swap and when i conect the map sensor vaccum line the idle jumps up and down and it does idle kinda hight
any ideas vaccum leak?

 

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/how-fix-your-idleing-woes-fitv-iacv-2153910/

Read, complete, no more idle surging.

Also make sure that your car has proper amount of anti freeze as well as all the air out of the cooling system. This meaning, you've gotten the car up to operating temp with the radiator cap removed and turned the heater on full blast to ensure all the air is out of the system.

Also leave the map sensor hooked up to the vacuum no matter what.

 

i had a similar problem, it turned out to be a TPS problem

 

tri pullin off tha iacv(back of intake wit two coolant hoses) theres a screen n there that gets carbon buildup..clean it wit carbcleana, did that ta mine an got that emission idle goin on